WIKA TR21-C - Manual (Page 8)

14006814.01 05/2011 GB/D/F/E
8 WIKA operating instructions model TR21
GB
3. Specifications
Output signal Pt100
Temperature range Measuring range -50 ... +150 °C, -50 ... +250 °C
Measuring element Pt100 (measuring current: 0.1 ... 1.0 mA) standard measuring resistor
Pt100 (measuring current: 0.1 ... 1.0 mA) face-sensitive measuring
resistor 1)
Connection method 3-wire
4-wire
Sensor tolerance value 2)
per DIN EN 60751
Class B
Class A
Class AA
Output signal 4 ... 20 mA
Temperature range Measuring range -50 ... +150 °C, -50 ... +250 °C 3)
Measuring element Pt100 (measuring current: 0.5 mA) standard measuring resistor
Pt100 (measuring current: 0.5 mA) face-sensitive measuring resis-
tor 1)
Connection method 3-wire
Sensor tolerance value 2) 4)
per DIN EN 60751
Class B
Class A
Class AA
Measuring span minimum 20 K, maximum 300 K
Basic configuration Measuring range -50 ... +150 °C, -50 ... +250 °C depending on the
selected temperature range, other measuring ranges are adjustable
Analogue output 4 ... 20 mA, 2-wire
Measuring deviation
per DIN EN 60770, 23 °C ±5 K
0.2 % (Transmitter) 4)
Linearisation linear to temperature per DIN EN 60751
Linearisation error ±0.1 % 5)
Switch-on delay, electrical < 10 ms
Signalling of sensor burnout configurable: NAMUR downscale < 3.6 mA (typically 3 mA)
NAMUR upscale > 21.0 mA (typically 23 mA)
Sensor short-circuit not configurable, generally NAMUR downscale < 3.6 mA (typically
3 mA)
Load R
A
R
A
≤ (U
B
- 10 V) / 0.023 A with R
A
in Ω and U
B
in V
Effect of load ± 0.05 % / 100 Ω
Power supply DC 10 ... 35 V
Max. permissible residual ripple 10 % at 24 V / maximum 300 Ω Load
Power supply input protected against reverse polarity
3. Specifications
Readings in % refer to the measuring span
For a correct determination of the overall measuring error, both sensor and transmitter measuring deviations have to
be considered.
1) The small design of the face-sensitive measuring resistors leads to reduced heat dissipation with short insertion lengths.
Available for temperature range -50…+150 °C in Classes A and B.
Face-sensitive measuring resistors are generally used for thermowell insertion lengths smaller than 11 mm.
2) For detailed specifications for Pt100 sensors, see Technical Information IN 00.17 at www.wika.com
3) The temperature transmitter should therefore be protected from temperatures over 85 °C
4) For measuring spans smaller than 50 K additional 0.1 K
5) ± 0.2 % for measuring ranges with a lower limit less than 0 °C